fix: normalize a typed browser address before opening a session

[nvtoan0201-swe]

What changed

The Browser screen's "Open session" button posted the raw text field value, while the in-session address bar (details.tsx) and the computer sheet (computer.tsx) both normalize through browserAddress first. The server requires an absolute URL (z.url()), so typing copilotkit.ai in this one field failed validation even though the same text works in every other browser entry point.

The address is now normalized before the request. browserAddress already covers scheme-less hosts, credentials, and malformed input in apps/mobile/test/browser-address.test.ts.

Verification

• pnpm test — 276 pass, 0 fail
• pnpm lint
• pnpm typecheck (root + mobile)

Integration limits

The component wiring itself is not covered by the repo's node:test helpers (they cover pure modules); the normalization helper it calls is covered.

AI assistance was used to prepare this change; I reviewed the code and ran the checks above.

[jerelvelarde]

Value: typed browser addresses use the existing normalization/validation helper before opening a session. Two address-helper tests, changed-file Biome, mobile typecheck and diff checks pass after retaining both browserAddress and startOfZonedDay imports during main integration. Worker-side URL/security policy remains intact. Template: clear narrow fix and checks; please add UI evidence/platform limits if not supplied. No actionable security issue. Merge after required CI.